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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
No need for another kata about prime numbers. It is a duplicated of many others. Furthermore there are no random tests and no basic tests in "Your example test cases".
Zero work has been put into this kata. Just look at my solution. Makes no sense whatsoever without more test cases especially random ones.